Engineering and Informaticshttp://hdl.handle.net/10454/4132018-12-18T08:20:16Z2018-12-18T08:20:16Z3D printed elastic mould granulationOkeyo, ClintChowdhury, D.F.Cheung, K.Rahmanian, Nejathttp://hdl.handle.net/10454/167002018-12-15T01:07:01Z2018-01-01T00:00:00ZOkeyo C, Chowdhury DF, Cheung K et al (2018) 3D printed elastic mould granulation. Powder Technology. Accepted for Publication.
In the pharmaceutical industry, enhanced process understanding resulting in superior control of product attributes, has the potential to save up to 20% of process engineering and product development costs during drug development. With the aim of achieving enhanced process understating, a novel approach for granulation of fine powders is presented. First, a mould with the desired particle shape and size is created using 3D printing followed by casting using elastomeric material. The formulation is prepared through wet massing and tested as a thin film on flat elastomeric membranes. The thin film itself can be a product but it also gives a good indication of coating performance before coating the patterned elastic membrane with the formulation i.e., 3D printed elastic mould granulation. Results show that following granulation and drying, granules of controlled size and shape (e.g. cubic and 500 μm), strength, friability and flowability can be formed. The method presented may allow for more robust process development in particle engineering.
2018-01-01T00:00:00ZDrag coefficient modelling study for flexible vegetation in open channel flowHussain, A.Pu, Jaan H.Hanmaiahgari, P.R.http://hdl.handle.net/10454/166902018-12-06T07:30:09Z2018-11-01T00:00:00ZHussain A, Pu JH and Hanmaiahgari PR (2018) Drag coefficient modelling study for flexible vegetation in open channel flow. At: Spain Water 2018 Conference. 15 Nov 2018, Madrid, Spain.
Vegetation remains to be an important factor that can hinder the river flow. It needs innovative management scheme, in order
to adapt these changes and ensure sustainability of their multiple usages. Vegetation plays an important role in floods and
droughts adaptation within river system to alleviate any flood that may propagates from river to its surrounding. Vegetation within
river can also retard its flow to cause building-up of deposition, and further adding to uncertainty of water use under extreme
droughts. Due to these, it is important to study and understand vegetation drag behaviour toward flow in order to prevent flood
risk and water security with hydrological drought in the basin and any other negative impact caused by it. In this study, an
analytical approach for river flooding has been studied by improved representation of drag coefficient CD in flow velocity
distribution modelling. The analysis of flow parameters, i.e. Reynolds number, on the drag coefficient CD has been conducted.
The presented model has been used and analysed in open channel flows with flexible vegetation. In modelling, the flexible
vegetated channel layers were divided into vegetation, top of vegetation and water layer zones in the model. The balance of
forces for each layer has been established by validation using different reported measured data. The modelling results showed
reasonably corresponding prediction of velocity profile in flows with flexible vegetation.
2018-11-01T00:00:00ZA New Polarization-Reconfigurable Antenna for 5G ApplicationsAl-Yasir, YasirAbdullah, A.S.Ojaroudi Parchin, NaserAbd-Alhameed, Raed A.Noras, James M.http://hdl.handle.net/10454/166842018-12-04T01:10:29Z2018-11-02T00:00:00ZAl-Yasir Y, Abdullah AS, Ojaroudi Parchin N et al (2018) A New Polarization-Reconfigurable Antenna for 5G Applications. Electronics. 7(11): 293.
This paper presented a new circular polarization reconfigurable antenna for 5G wireless
communications. The antenna, containing a semicircular slot, was compact in size and had a good
axial ratio and frequency response. Two PIN diode switches controlled the reconfiguration for both
the right-hand and left-hand circular polarization. Reconfigurable orthogonal polarizations were
achieved by changing the states of the two PIN diode switches, and the reflection coefficient |S11|
was maintained, which is a strong benefit of this design. The proposed polarization-reconfigurable
antenna was modeled using the Computer Simulation Technology (CST) software. It had a 3.4 GHz
resonance frequency in both states of reconfiguration, with a good axial ratio below 1.8 dB, and good
gain of 4.8 dBic for both modes of operation. The proposed microstrip antenna was fabricated on an
FR-4 substrate with a loss tangent of 0.02, and relative dielectric constant of 4.3. The radiating layer
had a maximum size of 18.3 18.3 mm2, with 50 W coaxial probe feeding.
2018-11-02T00:00:00ZDesign of very compact Combline Band-Pass Filter for 5G applicationsAl-Yasir, YasirAbd-Alhameed, Raed A.Noras, James M.Abdulkhaleq, Ahmed M.Ojaroudi Parchin, Naserhttp://hdl.handle.net/10454/166822018-12-04T01:10:22Z2018-11-13T00:00:00ZAl-Yasir Y, Abd-Alhameed RA, Noras JM et al (2018) Design of very compact Combline Band-Pass Filter for 5G applications. The Loughborough Antennas & Propagation Conference (LAPC 2018) Nov 12-13, Loughborough, UK.
In this paper, a compact microstrip band-pass filter (BPF) covering the 3.4 to 3.8 GHz spectrum bandwidth for 5G wireless communications is presented. The planar filter uses three resonators, each terminated by a via to hole ground at one end and a capacitor at the other end with 50 Ω transmission line impedances for input and output terminals. The coupling between the lines is adjusted to resonate at the centre frequency with third-order band-pass Butterworth properties. The proposed combline filter is designed on an alumina substrate with a relative dielectric constant of 9.8 and a very small size of 9×5×1.2 mm3. The proposed filter is simulated and
2018-11-13T00:00:00ZFrequency Reconfigurable Antenna Array for MM-Wave 5G Mobile HandsetsOjaroudi Parchin, NaserAl-Yasir, YasirAbdulkhaleq, Ahmed M.Elfergani, I.Rayit, A.Noras, James M.Rodriguez, JonathanAbd-Alhameed, Raed A.http://hdl.handle.net/10454/166802018-11-30T01:05:07Z2018-09-20T00:00:00ZOjaroudi Parchin N, Al-Yasir Y, Abdulkhaleq A.M et al (2018) Frequency Reconfigurable Antenna Array for MM-Wave 5G Mobile Handsets. 9th International Conference on Broadband Communications, Networks, and Systems (Broadnets 2018) Sept 19-20, Faro, Portugal.
This study proposes a compact design of frequency-reconfigurable
antenna array for fifth generation (5G) cellular networks. Eight compact discrete-
fed slot antennas are placed on the top portion of a mobile phone printedcircuit-
board (PCB) to form a beam-steerable array. The frequency response of
the antenna can be reconfigured to operate at either 28 GHz or 38 GHz, two of
the candidate frequency bands for millimeter-wave (MM-Wave) 5G communications.
The reconfigurability function of the proposed design can be achieved
by implementing and biasing a pair of diodes across each T-shaped slot antenna
element. Rogers RT 5880 with thickness of 0.508 mm and properties of ε = 2.2
and δ = 0.0009 has been used as the antenna substrate. The antenna element is
very compact in size with a good end-fire radiation pattern in the frequency
bands of interest. The proposed beam-steerable array provides very good 3D
coverage. The simulation results show that the proposed design provides some
good characteristics fitting the need of the 5G cellular communications.
2018-09-20T00:00:00Z